An elevation is different. It shows the face of something, or perhaps more correct, the projection of an object/s to a plane. But my testing suggests it produces SECTIONS, not elevations.
Yes, you can use abbreviations in tables and figures. All abbreviations used in tables and figures should be defined in the table note or figure caption, respectively, even though the abbreviations will be also be defined in the text if they are used there.
1 : a straight line about which a body or a geometric figure rotates or may be thought of as rotating the earth's axis. 2 : a line of reference used to assign numbers to locations in a geometric plane.